Engine/Transmission (1998.5 - 2002) fuel pressure question

[Smokin Joes 2500]

Well I let my buddy borrow my truck this weekend nothin wrong when it left now the rear brakes squeak & my fuel pressure gauge is going crazy. The needle flutters violently back and forth about 5-10 psi. It usually stays steady as a rock and never moves unless for the obvious Please help Im worried my baby is not the way it was... So much for being a good friend. Please help need answeres Im panicing

 

[jhyatt]

what kind of gauge mech or elec?what brand ?what kind of fuel pump ?fass or stock.

 

[Smokin Joes 2500]

Originally posted by jhyatt

what kind of gauge mech or elec?what brand ?what kind of fuel pump ?fass or stock.

Mech. gauge Auto meter (brand new) All stock truck only has 11,600 miles on it. I called my buddy and he said it did it from the time he had it, but when I dropped it off Friday night it was fine. He towed a 32 ft enclosed trailer down to west virginia.

 

[Smokin Joes 2500]

??

Is my gauge bad??? Only on the truck for about 6-8 months????

Help... . anyone???

 

[jhyatt]

maybe water in fuel? check with a testing gauge for pressure. also how are your boost #'s before and trip maybe cloged fuel filter

 

[monkeyman]

Fuel pressure

I would check your Isolator. Check for any leaks,etc. . Also where are you getting your fuel into isolator?

 

[PJStevenson]

Your gauge is probably bad. I have gone through 2 gauges so far it took some trial and error and a lot of reading the post on this board to figure out I needed a needle valve to slow the pulsating, and I had to leave air in the line again to help with keeping the needle from bouncing. I would check with auto-meter and see if they will replace it. Hope this helps.

 

[Smokin Joes 2500]

F.P.

Boost and fuel pressure good B4 trip so I dont think its the filter(might be though) I am not running an isolater, running directly off of injection pump. I have another F. P. gauge will try when its daylight. Also I checked for leaks as soon as I got home and it was all dryer than a popcorn fart. Does anyone know where I can get a needle valve?? Ive heard a lot of talk about them bout dont know what they are? Will send gauge to Auto Meter if it is indeed bad. Hopefully they will replace it. Thanks for your replies fellas any more ideas are welcomed. Thanks again, Smokin Joe

 

[PJStevenson]

Here is a link to Grainger thst shows a picture and if you open an account you can order from them. That is what I ended up doing. http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1612835780&ccitem=